Home Forums Reloading Varmint Rifles Who makes 223 Rem Bolt With Fast Twist Barrel?

Cores out of whack/slipping perhaps?

That's odd.
Nosler solid base stuff is legendary for keeping obturation down and imparting rotational torque, by design. The impact extrusion method also is well known for "coddling cores" and keeping/having cores balanced.

I recall us having this conversation and mentioning how speed and twist proof BTs were!